/*
 * Copyright (C) 2013 Maciej Górski
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package pl.mg6.android.maps.extensions.impl;

import java.util.HashSet;
import java.util.Set;

import android.os.Handler;
import android.os.Handler.Callback;
import android.os.Message;

class ClusterRefresher {

	private Set<ClusterMarker> refreshQueue = new HashSet<ClusterMarker>();
	private boolean refreshPending;
	private Handler refresher = new Handler(new Callback() {
		public boolean handleMessage(Message msg) {
			refreshAll();
			return true;
		}
	});

	void refresh(ClusterMarker cluster) {
		refreshQueue.add(cluster);
		if (!refreshPending) {
			refresher.sendEmptyMessage(0);
			refreshPending = true;
		}
	}

	void cleanup() {
		refreshQueue.clear();
		refreshPending = false;
		refresher.removeMessages(0);
	}

	void refreshAll() {
		for (ClusterMarker cluster : refreshQueue) {
			cluster.refresh();
		}
		cleanup();
	}
}
